Cub-cadet RZT-S Series User Manual download pdf (Page 16)

RZT-S

Evaporative (EVAP) emissions system

The EPA has enacted rules that regulate the amount of vapors an engine’s fuel system is allowed to vent to the

atmosphere. The rules are know as tier III emissions guidelines. These rules apply to all engines built on or after 1/1/

2012. Some of the requirements of tier III emissions include:

• Tethered fuel caps.

• Unvented fuel caps.

• Low permeation (GREENbar

) fuel line

• Roll over valve vents

The fuel tank has an unvented fuel cap. The fuel tank

vents through the roll over valve. The vapors will flow

through the vent hose (black hose with a red trace) to the

engine. See Figure 2.11.

The EVAP system, from the fuel tank up to the engine

connector, is a Cub Cadet system, meaning warranty and

parts are handled by Cub Cadet.

The engine side of the system varies by engine manu-

facturer, but on most engines the vent hose will go to the

air intake manifold.

NOTE: Units sold in California will have a charcoal

canister to further reduce the amount of

emissions that escape from the fuel system.

The fuel tank will vent through the charcoal

canister. The charcoal in the canister will act

as a filter and remove some of the vapors

that are venting out of the fuel tank.

A second vent hose connects the canister to

the engine. As the engine runs, the vacuum

in the intake manifold will draw the vapors

out of the charcoal, recharging it.

See Figure 2.12.

NOTE: A leak in the vent hose will allow dirt injec-

tion in the engine. This will not affect engine

performance until the dirt ingestion has

cause damage inside the engine.

%NGINE

Figure 2.11

Fuel tank

Fuel pick up tube

Fuel cap

Roll over valve

49 state fuel system

%NGINE

#HARCOAL

CANISTER

6ENT

Figure 2.12

California fuel system

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Cub-cadet RZT-S Series User Manual Page 16

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